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What does rr mean statistically?
Relative risk (RR) is a statistical concept. RR refers to the ratio of the probability that a group is exposed to a certain risk and not exposed to that risk.

The germination of statistics was first bred for a long time in Italy, where the European economy was developing rapidly at that time, but it finally broke ground in Germany in the17th century. The school of national conditions, also known as the narrative school, was born in Germany in the17th century. Because this school mainly describes the major issues of the country in words, it is called the narrative school. Its main representatives are Hailmann Kang Ling and Ahenwall.

Kang Ling was the first person to teach the knowledge that political activists should have at Tete University in Helms. Ahenwall opened a course of "Ethnic Studies" at the University of G? ttingen, and his main work is "Outline of Ethnic Studies in Modern European Countries".

The book tells the story of "the remarkable events of a country or most countries", and mainly uses the method of comparative analysis to study and understand the organization, territory, population, resource wealth and national strength of a country, and compare the strength of various countries to serve the German monarchy.

Because "national conditions" and "statistics" have the same meaning in foreign languages, they were officially named "statistics" later. In the comparative analysis of national conditions, this school emphasizes the explanation of the essence of things, but does not pay attention to quantitative comparison and quantitative calculation, but it lays the economic theoretical foundation for the development of statistics.

However, with the development of capitalist market economy, the calculation and analysis of things become more and more important. Later, this school was divided into the chart school and the comparison school.